package com.yuelao.util;

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddress;
import javax.servlet.http.HttpServletResponse;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;

/**
 * Excel处理工具类
 * @author FLY
 * @version v1.0
 * @project yuelao-server
 * @date 2017/9/12 16:13
 * @修改记录 版本       修改人         修改时间         修改内容描述
 * --------------------------------------------------
 * <p>
 * --------------------------------------------------
 */
public class ExcelUtil {
    /**
     * 生成工作簿
     * @param title
     * @param rowName
     * @param dataList
     * @return
     * @throws Exception
     */
    public static HSSFWorkbook  generBook(String title, String[] rowName, List<Object[]> dataList) throws Exception {
        HSSFWorkbook workbook = new HSSFWorkbook();  // 创建工作簿对象
        HSSFSheet sheet = workbook.createSheet(title); // 创建工作表
        // 产生表格标题行
        HSSFRow rowm = sheet.createRow(0);
        HSSFCell cellTiltle = rowm.createCell(0);

        //sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面  - 可扩展】
        HSSFCellStyle columnTopStyle = getColumnTopStyle(workbook);//获取列头样式对象
        HSSFCellStyle style = getStyle(workbook);  //单元格样式对象

        sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length - 1)));
        cellTiltle.setCellStyle(columnTopStyle);
        cellTiltle.setCellValue(title);

        // 定义所需列数
        int columnNum = rowName.length;
        HSSFRow rowRowName = sheet.createRow(2);  // 在索引2的位置创建行(最顶端的行开始的第二行)

        // 将列头设置到sheet的单元格中
        for (int n = 0; n < columnNum; n++) {
            HSSFCell cellRowName = rowRowName.createCell(n);  //创建列头对应个数的单元格
            cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING); //设置列头单元格的数据类型
            HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
            cellRowName.setCellValue(text);  //设置列头单元格的值
            cellRowName.setCellStyle(columnTopStyle); //设置列头单元格样式
        }

        //将查询出的数据设置到sheet对应的单元格中
        for (int i = 0; i < dataList.size(); i++) {

            Object[] obj = dataList.get(i);//遍历每个对象
            HSSFRow row = sheet.createRow(i + 3);//创建所需的行数

            for (int j = 0; j <= obj.length; j++) {
                HSSFCell cell = null;   //设置单元格的数据类型
                if (j == 0) {
                    cell = row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC);
                    cell.setCellValue(i + 1);
                } else {
                    cell = row.createCell(j, HSSFCell.CELL_TYPE_STRING);
                    if ("".equals(obj[j-1]) && obj[j-1] == null) {
                        cell.setCellValue(""); //设置单元格的值
                    } else {
                        cell.setCellValue(String.valueOf(obj[j-1]));   //设置单元格的值
                    }
                }
                cell.setCellStyle(style); //设置单元格样式
            }
        }
        //让列宽随着导出的列长自动适应
        for (int colNum = 0; colNum < columnNum; colNum++) {
            int columnWidth = sheet.getColumnWidth(colNum) / 256;
            for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
                HSSFRow currentRow;
                //当前行未被使用过
                if (sheet.getRow(rowNum) == null) {
                    currentRow = sheet.createRow(rowNum);
                } else {
                    currentRow = sheet.getRow(rowNum);
                }
                if (currentRow.getCell(colNum) != null) {
                    HSSFCell currentCell = currentRow.getCell(colNum);
                    if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
                        int length = currentCell.getStringCellValue().getBytes().length;
                        if (columnWidth < length) {
                            columnWidth = length;
                        }
                    }
                }
            }
            if (colNum == 0) {
                sheet.setColumnWidth(colNum, (columnWidth - 2) * 256);
            } else {
                sheet.setColumnWidth(colNum, (columnWidth + 4) * 256);
            }
        }
        return workbook;
    }

    /**
     * 返回客户端文件
     * @param response
     * @param workBook
     */
    public static void resExcel(HttpServletResponse response, HSSFWorkbook workBook, String fileName) {
        try {
            String fileDer = fileName + ".xls";
            response.setContentType("application/octet-stream;charset=utf-8");
            response.setHeader("Content-Disposition", "attachment;filename="
                    + new String(fileDer.getBytes(),"iso-8859-1") );
            OutputStream out = response.getOutputStream();
            workBook.write(out);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /*
     * 列头单元格样式
     */
    public static HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {

        // 设置字体
        HSSFFont font = workbook.createFont();
        //设置字体大小
        font.setFontHeightInPoints((short) 11);
        //字体加粗
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        //设置字体名字
        font.setFontName("Courier New");
        //设置样式;
        HSSFCellStyle style = workbook.createCellStyle();
        //设置底边框;
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        //设置底边框颜色;
        style.setBottomBorderColor(HSSFColor.BLACK.index);
        //设置左边框;
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        //设置左边框颜色;
        style.setLeftBorderColor(HSSFColor.BLACK.index);
        //设置右边框;
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        //设置右边框颜色;
        style.setRightBorderColor(HSSFColor.BLACK.index);
        //设置顶边框;
        style.setBorderTop(HSSFCellStyle.BORDER_THIN);
        //设置顶边框颜色;
        style.setTopBorderColor(HSSFColor.BLACK.index);
        //在样式用应用设置的字体;
        style.setFont(font);
        //设置自动换行;
        style.setWrapText(false);
        //设置水平对齐的样式为居中对齐;
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        //设置垂直对齐的样式为居中对齐;
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);

        return style;

    }

    /**
     * 列数据信息单元格样式
     * @param workbook
     * @return
     */
    public static HSSFCellStyle getStyle(HSSFWorkbook workbook) {
        // 设置字体
        HSSFFont font = workbook.createFont();
        //设置字体大小
        //font.setFontHeightInPoints((short)10);
        //字体加粗
        //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        //设置字体名字
        font.setFontName("Courier New");
        //设置样式;
        HSSFCellStyle style = workbook.createCellStyle();
        //设置底边框;
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        //设置底边框颜色;
        style.setBottomBorderColor(HSSFColor.BLACK.index);
        //设置左边框;
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        //设置左边框颜色;
        style.setLeftBorderColor(HSSFColor.BLACK.index);
        //设置右边框;
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        //设置右边框颜色;
        style.setRightBorderColor(HSSFColor.BLACK.index);
        //设置顶边框;
        style.setBorderTop(HSSFCellStyle.BORDER_THIN);
        //设置顶边框颜色;
        style.setTopBorderColor(HSSFColor.BLACK.index);
        //在样式用应用设置的字体;
        style.setFont(font);
        //设置自动换行;
        style.setWrapText(false);
        //设置水平对齐的样式为居中对齐;
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        //设置垂直对齐的样式为居中对齐;
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        return style;
    }

}
